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Full Discussion: Delete unique rows - optimize script
Top Forums Shell Programming and Scripting Delete unique rows - optimize script Post 302701419 by varu0612 on Sunday 16th of September 2012 03:08:16 AM
Old 09-16-2012
Delete unique rows - optimize script
Hi all,

I have the following input - the unique row key is 1st column

Code:
cat file.txt
 
[4] A response
[1] C request
[1] C response
[3] D request
[2] C request
[2] C response
[5] E request

The desired output should be

Code:
[1] C request
[1] C response
[2] C request
[2] C response

Now i have implemented the below loop which does work but when the input file is bigger than 300 mb in size the whole process of removing the non-pairs rows takes ages since it needs to scan the whole file in a loop.

Code:
#/bin/bash
req=$(mktemp)
res=$(mktemp)
new=$(mktemp)
tmp=$(mktemp)
grep request  $1 > $req
grep response $1 > $res
for id in `cat $req | awk '{ print $1}'` 
do    
    id=$(echo $id | tr -d "[]")
    grep "$id" $res > $tmp 
    if [[ -s $tmp ]]
    then
 grep "$id" $req >> $new
 cat $tmp >> $new 
    fi
done
mv $new $2
rm $req $res $tmp

Any idea how i can optimize/ do it differently to remove the unique rows as per above example in order to speed up the process?
 

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LEARN ABOUT OPENSOLARIS

ne_get_status

NE_GET_STATUS(3)						neon API reference						  NE_GET_STATUS(3)

NAME

       ne_get_status - retrieve HTTP response status for request

SYNOPSIS

       #include <ne_request.h>

       const ne_status *ne_get_status (const ne_request *request);

DESCRIPTION

       The  ne_get_status  function  returns  a pointer to the HTTP status object giving the result of a request. The object returned only becomes
       valid once the request has been successfully dispatched (the return value of ne_request_dispatch or ne_begin_request was zero). The  object
       remains valid until the associated request object is destroyed.

SEE ALSO

       ne_status(3), ne_request_create(3)

EXAMPLE

       Display the response status code of applying the HEAD method to some resource.

       ne_request *req = ne_request_create(sess, "HEAD", "/foo/bar");
       if (ne_request_dispatch(req))
	  /* handle errors... */
       else
	  printf("Response status code was %d
", ne_get_status(req)->code);
       ne_request_destroy(req);

AUTHOR

       Joe Orton <neon@webdav.org>.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWneon	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for Neon is available on http://opensolaris.org.

neon 0.25.5							  20 January 2006						  NE_GET_STATUS(3)
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